question_answer 45)

  Two car garages have a common gate which needs to open automatically when a car enters either of the garages or cars enter both. Devise a circuit that resembles this situation using diodes for this situation.

Answer:

                  The illustration resembles with OR gate as shown in Fig. 9(EP).11(a). The truth table of OR gate is given in Fig. 9(EP).11(b), which illustrates the given problem.